## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$\dfrac{1}{y^{4}}$
Using the laws of exponents, the given expression, $y^{-5}\cdot y$, is equivalent to \begin{array}{l} y^{-5+1} \\\\= y^{-4} \\\\= \dfrac{1}{y^{4}} .\end{array}